https://www.economiesuisse.ch/de/print/pdf/node/48305
http://www.europarl.europa.eu/ftu/pdf/en/FTU_5.9.1.pdf
https://www.bancaditalia.it/compiti/riserve-portafoglio-rischi/cis/Presentazione_CIS_5.07.2021.pdf?language_id=1
https://www.ips-journal.eu/topics/economy-and-ecology/one-currency-to-rule-them-all-6933/